feat(commercial) : 2e email de facturation optionnel sur l'adresse client (ERP-119)

Pendant du telephone secondaire (max 2). Bump @malio/layer-ui 1.7.8 (prop
addable du MalioInputEmail).

- back : colonne billing_email_secondary (migration + COMMENT + catalogue),
  propriete ClientAddress (Email + Length), Callback etendu (2e email interdit
  hors facturation, optionnel sinon), normalisation lowercase au Processor.
- front : draft + flag UI hasSecondaryBillingEmail, mappers, payloads, champ
  MalioInputEmail :addable -> revele un 2e champ ; layout : 2e email qui coule
  dans la grille et Adresse complementaire sur une colonne.
- tests back (2 emails / 2e email hors facturation) et front (payload).

frontend/modules/commercial/utils/__tests__/clientEdit.spec.ts

@@ -160,10 +160,14 @@ describe('buildContactPayload / buildAddressPayload / buildRibPayload', () => {
             id: 3, isProspect: false, isDelivery: false, isBilling: true, isBroker: false, isDistributor: false, country: 'France',
             postalCode: '86100', city: 'Châtellerault', street: '1 rue X', streetComplement: null,
             categoryIris: ['/api/categories/2'], siteIris: ['/api/sites/1'], contactIris: [],
-            billingEmail: 'facturation@acme.fr',
+            billingEmail: 'facturation@acme.fr', billingEmailSecondary: 'compta@acme.fr', hasSecondaryBillingEmail: true,
         }
         expect(buildAddressPayload(address, true).billingEmail).toBe('facturation@acme.fr')
         expect(buildAddressPayload(address, false).billingEmail).toBeNull()
+        // 2e email : transmis si facturation + revele, sinon null (ERP-119).
+        expect(buildAddressPayload(address, true).billingEmailSecondary).toBe('compta@acme.fr')
+        expect(buildAddressPayload(address, false).billingEmailSecondary).toBeNull()
+        expect(buildAddressPayload({ ...address, hasSecondaryBillingEmail: false }, true).billingEmailSecondary).toBeNull()
     })
 
     it('rib : label / bic / iban transmis tels quels', () => {
@@ -187,7 +191,7 @@ describe('buildContactPayload / buildAddressPayload / buildRibPayload', () => {
             id: null, isProspect: false, isDelivery: true, isBilling: false, isBroker: false, isDistributor: false, country: 'France',
             postalCode: null, city: '', street: null, streetComplement: null,
             categoryIris: ['/api/categories/2'], siteIris: ['/api/sites/1'], contactIris: [],
-            billingEmail: null,
+            billingEmail: null, billingEmailSecondary: null, hasSecondaryBillingEmail: false,
         }
         const payload = buildAddressPayload(address, false)
         expect('postalCode' in payload).toBe(false)